Where does “spion” come from?

spion (Hungarian) comes from German Spion, from French espion, from Middle French espion, from Old French espion, from Frankish *spehō, from Frankish spehōn, from Proto-Germanic spehōną, from Proto-Indo-European speḱ- — to see, to look, to observe.

spion (Hungarian): secret agent, undercover agent, informer, mole,...